What should I do about this? Switch between internal storage and external storage

I want to play big games, but the built-in storage on my phone is too small, and there's no way to install them on an external memory card. I saw a tutorial on Baidu that said you could swap them by modifying the vold.fstab file, but my Huawei customer customized version seems different. I need help, how should I modify it? My vold.fstab file data is as follows: Example of a standard sdcard mount for the emulator / Dream # Mounts the first usable partition of the specified device dev_mount sdcard /storage/sdcard0 emmc@fat /devices/platform/goldfish_mmc.0 /devices/platform/mtk-msdc.0/mmc_host dev_mount sdcard2 /storage/sdcard1 auto /devices/platform/goldfish_mmc.1 /devices/platform/mtk-msdc.1/mmc_host ## Example of a dual card setup # dev_mount left_sdcard /mnt/sdcard1 auto /devices/platform/goldfish_mmc.0 /devices/platform/mtk-sd.0/mmc_host/mmc0 # dev_mount right_sdcard /mnt/sdcard2 auto /devices/platform/goldfish_mmc.1 /devices/platform/mtk-sd.2/mmc_host/mmc2 ## Example of specifying a specific partition for mounts # dev_mount sdcard /mnt/sdcard 2 /devices/platform/goldfish_mmc.0 /devices/platform/msm_sdcc.2/mmc_host/mmc1 Looking for an expert, where should I modify it, and how?